Electronic component

Abstract

An electronic component includes a pair of first engaging parts and a pair of second engaging parts. Both of the pair of first engaging parts are arranged at side surfaces of a case parallel to each other in opposition to each other. Each of the pair of second engaging parts is arranged adjacent to each of the pair of first engaging parts. Each of the first engaging parts includes a first arm and first protrusion, each of the second engaging parts includes a second arm and second protrusion, and a length of the second protrusion is longer than a length of the first protrusion.

What is claimed is: 
     
         1 . An electronic component comprising:
 a rectangular case including a rectangular opening, the opening being covered with a board;   a pair of first engaging parts arranged in opposition to each other at side surfaces of the case parallel to each other; and   a pair of second engaging parts each arranged adjacent to the pair of first engaging parts at each of the side surfaces of the case, wherein   each of the pair of first engaging parts includes a first arm, the first arm includes a first end and a second end, the first end is provided at the case, and the second end includes a first protrusion protruded from the lateral face side of the board toward the surface thereof,   each of the pair of second engaging parts includes a second arm, the second arm includes a third end and a fourth end, the third end is provided at the case, and the fourth end includes a second protrusion protruded from the lateral face side of the board toward the surface thereof, and   a length of the second protrusion in a direction along the surface of the board is greater than a length of the first protrusion.   
     
     
         2 . The electronic component of  claim 1 , further comprising a cover attached to the case and covering the board, the first engaging parts and the second engaging parts, wherein
 assuming that a distance between the pair of first protrusions opposing to each other is X,   that a width of the board arranged between the pair of first engaging parts and between the pair of second engaging parts is Y, and   that a distance between each of the first engaging part and the second engaging part and an inner surface of the cover is Z,   a relationship among X, Y, and Z is the following formula:
   ( Y−X )/2< Z.    
   
     
     
         3 . The electronic component of  claim 1 , wherein
 the first arm possesses a first length and the second arm possesses a second length greater than the first length.   
     
     
         4 . The electronic component of  claim 1 , wherein
 a position of a tip of the second protrusion is higher than a position of a tip of the first protrusion in a thickness direction of the board.   
     
     
         5 . An electronic component comprising:
 a rectangular case including a rectangular opening, the opening being covered with a board;   a first engaging part arranged at least one of parallel side surfaces of the case to each other; and   a second engaging part arranged adjacent to the first engaging part at least one of the side surfaces of the case, wherein   the first engaging part includes a first arm, the first arm includes a first end and a second end, the first end is provided at the case, and the second end includes a first protrusion protruded from the lateral face side of the board toward the surface thereof,   the second engaging part includes a second arm, the second arm includes a third end and a fourth end, the third end is provided at the case, and the fourth end includes a second protrusion protruded from the lateral face side of the board toward the surface thereof, and   a length of the second protrusion in a direction along the surface of the board is greater than a length of the first protrusion.   
     
     
         6 . The electronic component of  claim 5 , further comprising a cover attached to the case and covering the board, the first engaging part and the second engaging part, wherein
 a gap is provided between each of the first engaging part and the second engaging part and an inner surface of the cover.   
     
     
         7 . The electronic component of  claim 5 , wherein
 the first arm possesses a first length and the second arm possesses a second length greater than the first length.   
     
     
         8 . The electronic component of  claim 5 , wherein
 a position of a tip of the second protrusion is higher than a position of a tip of the first protrusion in a thickness direction of the board.